_draw_cnet_bodyplan: eliminated the longitudinal edges (same WL index
across all stations) — in the body plan all sections are overlaid in
the same y-z plane so those connections produce confusing diagonal
spoke patterns radiating from bow/stern. Now only transverse section
polylines are drawn as the muted control-net underlay.
_draw_cnet_planview: likewise removed the redundant longitudinal layer
(waterline contours) because layer-3 already draws them bold on top.
Only the transverse station-direction edges are kept, which are the
genuinely new information in plan view.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
alro65
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